After aligning the sequences obtained for the segment of gltA with the corresponding sequences of other Rickettsia species available in GenBank, we determined that all sequences of larvae and nymph ticks belonged to the
genus Rickettsia.
The
genus Rickettsia contains [approximately equal to]25 validated species of bacteria; another 25 isolates that have not been fully characterized or have not received a species designation have also been described.
To the Editor: Rickettsia raoultii is an obligate intracellular gramnegative bacterium belonging to the spotted fever group (SFG) of the
genus Rickettsia. Genotypes RpA4, DnS14, and DnS28, originally isolated from ticks from Russia in 1999 (1), were designated as Rickettsia raoultii sp.
To the Editor: Members of the
genus Rickettsia have garnered much attention worldwide in recent years with the emergence of newly recognized rickettsioses.
Comparisons were also made with 16S rRNA sequences from 2 leech-associated forms placed within the genus Rickettsia (13,14), and with taxa from genus Neorickettsia, a group of obligate intracellular forms placed within the Ehrlichiaceae that have been isolated from trematodes.
tsutsugamushi and the genus Rickettsia by using primers that targeted a portion of the groEL gene because of its higher power of differentiation between closely related taxa.
Bacterial diversity in Amblyomma americanum (Acari: Ixodidae) with a focus on members of the
genus Rickettsia. J Med Entomol.
Spotted fever group (SFG) rickettsioses are caused by obligate intracellular gram-negative bacteria of the
genus Rickettsia and are transmitted by hematophagous arthropods, mainly ticks.
Diversity of
genus Rickettsia detected from ticks in Japan.
All 70 tick samples that tested positive for the genus Rickettsia were subjected to amplification with primers specific for the ompA gene.
Though the pathogenicity of the newly recognized species of the genus Rickettsia has not yet been proven definitively, it is prudent for clinicians in Poland and other European countries to be alert to possible appearances of infections caused by these pathogens.
To the Editor: The
genus Rickettsia consists of obligate intracellular bacteria that cause spotted fever and typhus fever; these bacteria are usually transmitted by an arthropod vector.
Rickettsia felis is a member of the
genus Rickettsia, which comprises intracellular pathogens that produce infections commonly called rickettsioses.